Grinding wheel dresser



May 19, 1953 c. D. CHANDLER GRINDING WHEEL DREssER Filed sept. 7, 1951 ATTORNEYS INVENTOR Patented May 19, 1953 ,"U'NITED STATES PATENT ori-Ice rCecil D. Chandler, Odessa, Tex.

Application September 7, 1951, Serial No. 245,543

This invention relates to grinding wheel dressers and-more particularly to a grinding wheel dresser adapted to be mounted onr a grinding machine frame or bed and carry a diamond point in contact with a rotating grinding wheel to dress the latter to desired form.

It is among the objects of the invention to provide an improved grinding wheel dresser which can be magnetically mounted on a metal base or frame adjacent a grinding wheel without the use of clamps or brackets and will carry a `diamond point implement in engagement with the wheel; which includes manually operated means Ifor moving the dressing point in a straight line transverselyof the wheel and foradjustably moving the pointl toward and away from the wheel; which can be used to trim a beveled surface at any desired angle on the wheel; `which can be readily movedvfromone grinding machine to another and can be conveniently stored whennot in use; and which is simple and durable in con- 3 Claims. (Cl. 125-11) struction, economical to manufacture, and posil tive and effective in operation. Other objects andvadvantages will become ap#- parent from a consideration of the following'description and the appended claims in conjunction with the accompanying drawing wherein:

Figure 1 is a side elevational view of a grinding wheel dresser illustrative of the invention; Figure 2 is a -top plan view of the grinding Wheel dresser illustrated in Figure 1;

Figure 3 isa longitudinal cross sectional view on the line 3--3 of Figure 2; and

Figure 4 is a transverse cross sectional Aview on the `line 4-4 ofv Figure 1.

With continued reference to the drawing, the grinding vwheel dresser illustrated therein comprises a base, generally indicated 'at I0, of rectangular shape including a magnetized base block I I, a top block I2 superimposed on the base block II and having a groovey I 3 extending longitudinally thereof and opening to the side thereof remote from the bottom block, and a separator plate I4 of non-magnetic material interposed between the top block I2 and the bottom block I I to space the magnet II from the block I2 of magnetically permeable material and maintain a substantially symmetrical magnetic field vfor the magnet.

, The groove I3 is undercut along at least one side thereof, as indicated at I5, and. a wear plate I6 is disposed in the groove against the undercut side I5 thereof. `Set screws I'I extend through tapped holes in the portion of the top block I2 between the undercutside of the groove and the adjacentside lof thev top block and bearvat their 2 f inner ends against the adjacent side of the wear plate IB for a purpose to be presently described.

The bottom block I I has a flat bottom surface and is provided with spaced apart apertures extending therethrough with their center line substantially perpendicular to the bottom surface of the block and the separator plate I4 is provided with apertures 'registeringwith lthe apertures in the bottom block. The top block I2 is provided with Atapped holes or recesses registering with the apertures in the separator platel and screw fasteners f8 extend through the registering apertures in the bottom block and the separator plate and are threaded into the corresponding tapped holes in the top block to'rigidly secure the components of the base together and provide the base of rectangular-shape. End plates 20 and 2| are secured to the base I0, one at veach end thereof, by suitable means, such as the screws 22 extending through 4apertures in the end plates and threaded into tapped holes in the bottom block I I of the base.

The end plates 20 and 2| are provided with apertures, as indicated at 23 and 24 respectively, opening into the groove I3 at the corresponding ends of the latter and a screw shaft 25 extends through the groove I3 and has reduced end portions 26 and 2'I journaled in the end plate apertures 23 and 24 respectively. A hand'crank 281s secured on one end'of the screw shaft 25 for im-` parting rotational movement in either direction to the latter. f

A slide block 30 of rectangular shape is mounteden the top block I2 of the base at the side of the topblock remote from the bottom block II and has spacedapart keys 3|, 32 and 33 slidabli7 received in the groove I3 and provided with fbeveled faces contacting the adjacent undercut yside ofthe wear plate I6 to hold the slide blockl against separation from the base while permitting sliding movement of the slide block longitudinally of the base. `'I'he two end keys 32 and 33 are provided with bores or apertures loosely receivingthe screw shaft 25 and the center key 3| is provided with a screw threaded aperture throughwhich the screw shaft is threaded, so that the slide block is moved longitudinally of the base when rotational moverent is imparted to the screw shaft by the crank The keys are maintained against play or looseness in the groove I3 and the frictional resistance to movement of the slide block relative to the base is controlled by adjusting the set screws I1 to adjustably-vary the pressure of the wear plate IE against the'beveled faces of the keys.y

The slide block 30 is provided with a bore 35 extending transversely therethrough substantially at the mid-length location of the slide block and with the center line of the bore substantially at right angles to the axis of the screw shaft 25 and inclined at an angle of approximately 15 degrees to the fiat bottom surface of the bottom block I I of the base. The bore 35 is provided With a counterbore extending from the end of the bore nearest the bottem vsurfzt'ce of the `base to' a location intermediateth length of the bore and the remainder of the bore from the counterbore to the end of the bore 35 most distant from the bottom face of the base is screw threaded. A dressing point carrier 36 is slidably mounted in the counterbore portion of the bore '35* and'piojects from the end of the bore nearestthe bottom surface of the base and this carrier carries apoint holder 37 which projects from the end of the-c'arrier disposed externally 'of the slide block 30 to engage' the'surfacevof an adjacent grinding wheel, as-indicatedf"at^3B. lAn' adjusting screw 39^is threaded'into thescrewthreaded* portion of the b'oreiiy and a crank oradiusting knob `4|) is providedffon the endy ofthe adjustingiscrew' projectn ing out of vthe-slide block. The-'endfof the "adjustinglscrew disposed inwardlyofthe' bore 35l contacts the 'adj acentend of the point vcarrier 38; so that the Ipoint Yoan be` moved toward and away from vthel "grindingy wheel 38 by rotating the adiusting screw 39.

'-By reasonof thef-'ma'gnetized 'bottom' block Il ofthe'b'ase, the gr'ndingwheel dresser can beset on' a' 'grinding'I-machine -frame orbed adjacent a srinding'wheel"and-fwill'adhere to 'the' frame or bed with sufficienti forcefto f maintain 'the dressing point in proper position for lvdressing the wheel, no brackets orfclamps being required to secure thedressertovthe machine frame'or bed. The

dresser =can= 'thus Abe *moved from# 'one f grinding 5 m'achine'to anotherl and. quickly placed` in"operative positionon'fa'machineI and can *be convenientlyisto'rediwhen not in use. 'It can also beset atdesiredfangles `relative 5to the rotational axes ofthe grindingfwheels'to trirn beveledsurfa'ces at desirediangles-onfthe wheels.

*The invention'may be embodied in otherspecinc formswithout departing :from the spirit or essential` characteristics' thereof. The present embodiment-,i is; xtherefore; 'tobe considered in' all respects as illustrative" and Ynot' restrictive; the scope of the invention being indicated by the appended claims rather than bythe 'foregoing'description; and all changes whichcorne within the meaning and 1range of vrequivalencv "of-*the claims are,H thereforeintended to be""embraced therein.

What -is claimed is:

1.-r 'Af-grinding Wheeldresser comprising ar base ofrectangular-shape' including a magnetized bottom'block, aitop` lblock superimposed on said bottorn block 'and having an Aundercut groove extending'flongitu'dinally thereof and opening'to thes'ide oflsaidtop"blockremote from said bottom block, and1 av` separator platev of non-magnetic material interposed between said topT and bottom jbl/ocks, endplates-secu'i'ed to' said baseone at 'each end thereof-'and'havingapertures opening into said groove'at the` vcorresponding ends of the latter, a slide block mounted on said top block for sliding movement iongitudinally ofthe latter and having a'keyf-slidably received in said groove and provided1 with a lvscrew threaded aperture extending transversely therethrough, a screwshaft journaledatitsends in the apertures-in said end plates and threaded through Vthe aperture insaid Y adjusting screw threaded into the screw threaded *portion of'sa'id bore and projecting from said one end thereof with its end disposed inwardly of said "boireA in -contact with the adjacent end of said -v point carrier.

2. A grinding wheel dresser comprising a base of rectangular shape inclu-ding a magnetized bottom block, a top block superimposed on said bottmfblock fand having `a groove extending longitudinally thereof opening -to'the'side `of'said topblock remote from said bottoni block vand provided" with at least onel undercut side,'and a separator 'plate vof non-magnetic n'iaterialinterposed between said top and bottomblocks, end plates securedto said baseone at each end thereof and having apertures opening into said groove at the corresponding ends 'of theilatter," aslide block mounted on said top block for'sliding move.- znent longitudinally o-f thelatter -and'ha'ving a key "slidably 'received'in' said groove andpr'ovided with a beveled face" adjacent the undercut side of "said groove and a screw threaded aperture leX- tending transversely therethrough; a' wear' plate disposed in said groove' between'the undercut side of the latter and the beveled face lof sa'id keyfset screvvs extending 'through `'tapped holes'in said top block and bearing at their inner ends against 'saidwear plate to `adj'ustably vary'the" pressure between "said Wear'V plate and thev beveled Yface of lvsaid'key,y a screw shaft journaledat/its ends in the apertures in said'endplatesand 'threaded through the aperture'in saidI key,'me`ans "connect'ed to said screwshaft for imparting" rota- -tional movements in either direction thereto v'to slide said slideY block Ilongitudinally of said base, said slide blockhaving a bore extending'transversely therethrough4 with its center line'subst'antially atl right angles to the axis of l"rotation of said screw shaft and 4inclined relativetothe surfaceofsaid bottom block remote yfrein said top block, said bore being threaded from'its end most distant vfrom said' bottom block toi-allocation intermediate the length thereof, a dressing pointv carrier slidably 'mounted in saidfbore and projecting fromthe end of the latter nearest said bottom block, and' anv adjusting screw threaded into the screw threaded portion of said bore and projecting therefrorn"with Yits end-disposed inwardly of said bore in contact with the adjacent end of said point carrier.

3. In a' grinding 4'Wheel dresser comprising a magnetized'base of rectangular shape having a flat-bottom 'surface adapted Ito rest on a horizontalsupporting surface'adjacent a grinding wheel and having a Igroove extending longitudinally thereof parallel to said bottom surface and opening Ito itstop surface, at least one side of 'said groove being undercut, a slide lblock slidably supported on said top surface and having a key"'slidablyreceivedin said groove and provided with a beveled face adjacent the undercut side of the groove, said liey-havingva 'screw threaded aperture extending transversely thefethro.ugh`,ra

screw shaft extending longitudinally of said groove and threaded through ythe :aperture in said key, means at the ends of said base journaling said screw shaft on said base, means connected to said screw shaft for imparting rotational movements thereto to move said slide block 1ongi-tudinally of said base, said slide block having a bore extending transversely .therethrough with its longitudinal center line substantially at right angles to the rotational axis of said screw 'shaft and inclined relative to the bottom surface. of said base, a dressing point carrier slidably mounted in said bore and projecting from one end of the latter, and an adjusting screw threaded into said bore and projecting from the other end of the latter With its end disposed in- Wardly of said bore in contact with the adjacent end of said dressing point carrier, said base comprising a body of sufcient mass to maintain the grinding wheel dresser solidly :on a supporting surface.

CECIL D. CHANDLER.

References Cited in the le of this patent UNITED STATES PATENTS 

